X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng%2Fcommands%2Fenable_channels.c;h=a5b15fae7f46e7b93856aa46545c73b872124244;hp=19b6b260bd7065e0b6490d8e247036483ecb14c6;hb=f73fabfda365d22e7dd180fb1614e37c446fbd9e;hpb=ca1c3607d2f5654163875cda874f43971df0f696 diff --git a/src/bin/lttng/commands/enable_channels.c b/src/bin/lttng/commands/enable_channels.c index 19b6b260b..a5b15fae7 100644 --- a/src/bin/lttng/commands/enable_channels.c +++ b/src/bin/lttng/commands/enable_channels.c @@ -1,19 +1,18 @@ /* * Copyright (C) 2011 - David Goulet * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; only version 2 - * of the License. + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2 only, + * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #define _GNU_SOURCE @@ -28,6 +27,8 @@ #include "../command.h" +#include + static char *opt_channels; static int opt_kernel; static char *opt_session_name; @@ -80,37 +81,34 @@ static struct poptOption long_options[] = { */ static void usage(FILE *ofp) { - fprintf(ofp, "usage: lttng enable-channel NAME[,NAME2,...] [options] [channel_options]\n"); + fprintf(ofp, "usage: lttng enable-channel NAME[,NAME2,...] [-u|-k] [OPTIONS]\n"); fprintf(ofp, "\n"); + fprintf(ofp, "Options:\n"); fprintf(ofp, " -h, --help Show this help\n"); fprintf(ofp, " --list-options Simple listing of options\n"); - fprintf(ofp, " -s, --session Apply on session name\n"); - fprintf(ofp, " -k, --kernel Apply on the kernel tracer\n"); -#if 0 - fprintf(ofp, " -u, --userspace [CMD] Apply for the user-space tracer\n"); - fprintf(ofp, " If no CMD, the domain used is UST global\n"); - fprintf(ofp, " or else the domain is UST EXEC_NAME\n"); - fprintf(ofp, " -p, --pid PID If -u, apply to specific PID (domain: UST PID)\n"); -#else - fprintf(ofp, " -u, --userspace Apply for the user-space tracer\n"); -#endif + fprintf(ofp, " -s, --session NAME Apply to session name\n"); + fprintf(ofp, " -k, --kernel Apply to the kernel tracer\n"); + fprintf(ofp, " -u, --userspace Apply to the user-space tracer\n"); fprintf(ofp, "\n"); fprintf(ofp, "Channel options:\n"); fprintf(ofp, " --discard Discard event when buffers are full%s\n", DEFAULT_CHANNEL_OVERWRITE ? "" : " (default)"); fprintf(ofp, " --overwrite Flight recorder mode%s\n", DEFAULT_CHANNEL_OVERWRITE ? " (default)" : ""); - fprintf(ofp, " --subbuf-size Subbuffer size in bytes\n"); + fprintf(ofp, " --subbuf-size SIZE Subbuffer size in bytes\n"); fprintf(ofp, " (default: %u, kernel default: %u)\n", DEFAULT_CHANNEL_SUBBUF_SIZE, DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE); - fprintf(ofp, " --num-subbuf Number of subbufers\n"); - fprintf(ofp, " (default: %u, kernel default: %u)\n", - DEFAULT_CHANNEL_SUBBUF_NUM, - DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM); - fprintf(ofp, " --switch-timer Switch timer interval in usec (default: %u)\n", + fprintf(ofp, " Needs to be a power of 2 for\n"); + fprintf(ofp, " kernel and ust tracers\n"); + fprintf(ofp, " --num-subbuf NUM Number of subbufers\n"); + fprintf(ofp, " (default: %u)\n", + DEFAULT_CHANNEL_SUBBUF_NUM); + fprintf(ofp, " Needs to be a power of 2 for\n"); + fprintf(ofp, " kernel and ust tracers\n"); + fprintf(ofp, " --switch-timer USEC Switch timer interval in usec (default: %u)\n", DEFAULT_CHANNEL_SWITCH_TIMER); - fprintf(ofp, " --read-timer Read timer interval in usec (default: %u)\n", + fprintf(ofp, " --read-timer USEC Read timer interval in usec (default: %u)\n", DEFAULT_CHANNEL_READ_TIMER); fprintf(ofp, "\n"); } @@ -151,10 +149,12 @@ static void set_default_attr(struct lttng_domain *dom) */ static int enable_channel(char *session_name) { - int ret = CMD_SUCCESS; + int ret = CMD_SUCCESS, warn = 0; char *channel_name; struct lttng_domain dom; + memset(&dom, 0, sizeof(dom)); + /* Create lttng domain */ if (opt_kernel) { dom.type = LTTNG_DOMAIN_KERNEL; @@ -185,7 +185,18 @@ static int enable_channel(char *session_name) ret = lttng_enable_channel(handle, &chan); if (ret < 0) { - goto error; + switch (-ret) { + case LTTNG_ERR_KERN_CHAN_EXIST: + case LTTNG_ERR_UST_CHAN_EXIST: + WARN("Channel %s: %s (session %s", channel_name, + lttng_strerror(ret), session_name); + goto error; + default: + ERR("Channel %s: %s (session %s)", channel_name, + lttng_strerror(ret), session_name); + break; + } + warn = 1; } else { MSG("%s channel %s enabled for session %s", opt_kernel ? "Kernel" : "UST", channel_name, @@ -196,7 +207,13 @@ static int enable_channel(char *session_name) channel_name = strtok(NULL, ","); } + ret = CMD_SUCCESS; + error: + if (warn) { + ret = CMD_WARNING; + } + lttng_destroy_handle(handle); return ret; @@ -295,6 +312,9 @@ int cmd_enable_channels(int argc, const char **argv) ret = enable_channel(session_name); end: + if (!opt_session_name && session_name) { + free(session_name); + } poptFreeContext(pc); return ret; }